1) Can you try to start Firefox in Safe Mode to see if Firefox works properly with no error? You can start Firefox in Safe Mode below:

• Windows/Mac: Go to Help > Restart with add-ons disabled
• Linux: Run firefox -safe-mode in the Terminal/Konsole

If Firefox opens up fine with no problems, it's probably one of your extensions that's causing the issue. You can re-enable your add-ons one by one until you find the one that causes the issue upon being re-enabled.

Some problems with Flash video playback can be resolved by disabling hardware acceleration in your Flash Player settings. (See this article for more information on using the Flash plugin in Firefox).

To disable hardware acceleration in Flash Player:

1. Go to this Adobe Flash Player Help page.
2. Right-click on the Flash Player logo on that page.
3. Click on Settings in the context menu. The Adobe Flash Player Settings screen will open.
4. Click on the icon at the bottom-left of the Adobe Flash Player Settings window to open the Display panel.
   
   The image "fpSettings1.PNG" does not exist.
   
5. Remove the check mark from Enable hardware acceleration.
6. Click Close to close the Adobe Flash Player Settings Window.
7. Restart Firefox.

This Flash Player Help - Display Settings page has more information on Flash Player hardware acceleration, if you're interested.

Bollocks. F'N bollocks. i knew it. i knew it. I kneW it. i kneW something had changed.. or-- i guess was about to [ to be more accurate... 'course whY i should worry about it when accuracy doesn't seem to be a priority....] Change.

"oh--yeah. We're changing the whole blessed thing..in ,like- a daY..! yah. new version comin' out. so-- might be an issue or two... " 

No.  Just that same,same,same  run in Safe Mode, disable your plug-ins crrrrap.  and why noT..?! that's what?-- 99% percent of the "troubleshooting" advice on the forums or even when one googles a particular problem. Or set of problems. No matter how varied they seem to be.  Pfffft. 
    :No offense to.. Moses? He was kind enough to reply. Appreciated.: 

But damn-- if you guys are gonna "troubleshooT"---- get Them to give you some proper ammunition.....

(and I'd ask whY there's a foreign language that I don't speak and didn'T select on there with my original question... --and I tried to remove after I saw [??] my question posted with it on there....

but i got it..  

   Run in Safe Mode and disable all my plug-ins...
   
    Right?  )

Tom,
I am glad it is working again after following Moses's advice.

You say give us volunteers better ammunition, would help with troubleshooting. Well one thing you could have done along those lines was to follow the prompts to include full troubleshooting information in your question.

You have marked the thread solved and so it appears running in safe mode with plugins disabled solved the issue for you. That is commonly seen in searches as a troubleshooting step because it is useful. Firefox is highly customisable something people like, but the downside is all the various addons do not always work well in every situation and combination.

The action was only intended as a troubleshooting step, but you may well have more than one single issue here and may need further help sorting that out. I appreciate you are frustrated & not swearing at Moses but you are probably more likely to find help if you tone down the language.

I can not be sure yet but probably most of you problems are not directly related to the upgrade of Firefox from Fx28 to Fx29.

ah.

  John99, is it?  Hiya.  As before I appreciate someone taking the time to reply period..  
   But..
 Heck--  [betteR??]  I didn't mark it solved. Or like it with the heart thing that was on there. Nope. Not anymore than i chose the foreign language that still seems to be coming up with it here. Nope.
  So yeahh-- ClearLy mad at the situation. I didn'T follow the ubiquitous..theoretically helpful advice. No.  As I saiD i tried all the usual troubleshooting Before I posted the question.. and thaT would certainly seem to qualify as "usual"..  That was ,of course, in addition to uninstalling and re-installing the browser,etc,etc..  So.. yeahhh
   But after I downloaded Chrome last night-- [for the first time ever] I was trying one more time to come up with a different solution.. --A novel approach in and of itself it seems-- but I did  <as I'D said> Like this browser,Darn It..  and only just happened to come across a PC World bit  or something.. about 29 coming out.. oH--- to-daY.!  whiLe googling the problem... so yeah   I'm sure that's probably just a huge coincidental type thing-- the version changing just then when the problems presented themselves out of the blue as I'D described. 

 Probably is.  yeah. 

  Anyway-- 
    the foreign languages popping up of their own accord-- and not ,it seems, able.. to then remove on the Forum here-- as well as -jeez- these things marking Themselves as 'solved'..!, huh?   wwell-- gosh-- now that's the kind of blue sky a problem-solving fellah would reallly chart a course for, i bet.. 

 Probably is.  yeah.